It's the latest in a series of hints that Leto will be reprising his role as The Joker in a DC Extended Universe movie in the near future, although we'll still not exactly sure where he'll fit in.

The most logical choice would be The Batman, a movie that would pair Leto with Ben Affleck for a battle we only got a taste of in last year's Suicide Squad.

Joe Manganiello's Deathstroke has long been rumoured as the main villain in The Batman, but that's no longer set in stone. Since Affleck recently dropped out as director, his replacement Matt Reeves is reportedly revamping the script.

If, some reason, Reeves opts to avoid The Joker as the main villain for The Batman, there are several other Batman-related projects that would suit an appearance from Leto.

The Joker's main squeeze Harley Quinn (Margot Robbie) is getting her own Suicide Squad spinoff Gotham City Sirens, which presumably would need to explain how she got away from Mr J after their prison break.

DC is also developing a Nightwing movie as well as Joss Whedon's Batgirl. Long-time DC Comics fans know that Batgirl and Joker have been disturbingly linked thanks to Alan Moore's groundbreaking graphic novel The Killing Joke.